Cessna Skylane (N21140)

April 23, 2020, 1132. A friend was leaving my house, south of ERV, headed for the highway. I heard a plane warming up. I waited to see if the plane did the right thing--took off on the E or W, and flew off. It didn't. Instead it circled around and over my property, then flew in over my NE corner low. I waited, and it did the entire circle again--this time intentionally flying very low on the east side, where my deer usually are; only this time, it flew so low that its flight was hidden by the trees. This flight was not on Flight Aware.